求高中所有函数公式

函数:一次函数 y=kx+b (k为任意不为零常数,b为任意常数)

正比例函数 y=kx(k为常数,且k≠0)

反比例函数 y=k/x (k为常数,k≠0)

二次函数 y=ax^2;+bx+c(a≠0,a、b、c为常数) 顶点式:y=a(x-h)^2+k或y=a(x+m)^2+k

交点式(与x轴):y=a(x-x1)(x-x2)

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三角函数公式:

正弦(sin):角α的对边比上斜边

余弦(cos):角α的邻边比上斜边

正切(tan):角α的对边比上邻边

余切(cot):角α的邻边比上对边

正割(sec):角α的斜边比上邻边

余割(csc):角α的斜边比上对边

sin30°=1/2

sin45°=根号2/2

sin60°=根号3/2

cos30°=根号3/2

cos45°=根号2/2

cos60°=1/2

tan30°=根号3/3

tan45°=1

tan60°=根号3

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两角和公式

sin(A+B) = sinAcosB+cosAsinB

sin(A-B) = sinAcosB-cosAsinB ?

cos(A+B) = cosAcosB-sinAsinB

cos(A-B) = cosAcosB+sinAsinB

tan(A+B) = (tanA+tanB)/(1-tanAtanB)

tan(A-B) = (tanA-tanB)/(1+tanAtanB)

cot(A+B) = (cotAcotB-1)/(cotB+cotA) ?

cot(A-B) = (cotAcotB+1)/(cotB-cotA)

倍角公式

Sin2A=2SinA?6?1CosA

Cos2A=Cos^A-Sin^A=1-2Sin^A=2Cos^A-1

tan2A=2tanA/1-tanA^2

三倍角公式

tan3a = tan a · tan(π/3+a)· tan(π/3-a)

半角公式

和差化积

sin(a)+sin(b) = 2sin[(a+b)/2]cos[(a-b)/2]

sin(a)-sin(b) = 2cos[(a+b)/2]sin[(a-b)/2]

cos(a)+cos(b) = 2cos[(a+b)/2]cos[(a-b)/2]

cos(a)-cos(b) = -2sin[(a+b)/2]sin[(a-b)/2]

tanA+tanB=sin(A+B)/cosAcosB

积化和差

sin(a)sin(b) = -1/2*[cos(a+b)-cos(a-b)]

cos(a)cos(b) = 1/2*[cos(a+b)+cos(a-b)]

sin(a)cos(b) = 1/2*[sin(a+b)+sin(a-b)]

cos(a)sin(b) = 1/2*[sin(a+b)-sin(a-b)]

诱导公式

sin(-a) = -sin(a)

cos(-a) = cos(a)

sin(π/2-a) = cos(a)

cos(π/2-a) = sin(a)

sin(π/2+a) = cos(a)

cos(π/2+a) = -sin(a)

sin(π-a) = sin(a)

cos(π-a) = -cos(a)

sin(π+a) = -sin(a)

cos(π+a) = -cos(a)

tanA=tanA = sinA/cosA

万能公式

词语:万能公式

释义:应用公式sinα=[2tan(α/2)]/{1+[tan(α/2)]^2}

cosα=[1-tan(α/2)^2]/{1+[tan(α/2)]^2}

tana=[2tan(a/2)]/{1-[tan(a/2)]^2}

将sinα、cosα、tanα代换成tan(α/2)的式子,这种代换称为万能置换。

推导:(字符版)

sinα=2sin(α/2)cos(α/2)=[2sin(α/2)cos(α/2)]/[sin(α/2)^2+cos(α/2)^2]=[2tan(α/2)]/[1+(tanα/2)^2]

cosα=[cos(α/2)^2-sin(α/2)^2]=[cos(α/2)^2-sin(α/2)^2]/[sin(a/2)^2+cos(a/2)^2]=[1-tan(α/2)^2]/[1+(tanα/2)^2]

tanα=tan[2*(α/2)]=2tan(α/2)/[1-tan(α/2)^2]=[2tan(a/2)]/[1-(tanα/2)^2]

其他非重点三角函数

csc(a) = 1/sin(a)

sec(a) = 1/cos(a)

双曲函数

sinh(a) = [e^a-e^(-a)]/2

cosh(a) = [e^a+e^(-a)]/2

tg h(a) = sin h(a)/cos h(a)

公式一:

设α为任意角,终边相同的角的同一三角函数的值相等:

sin(2kπ+α)= sinα

cos(2kπ+α)= cosα

tan(2kπ+α)= tanα

cot(2kπ+α)= cotα

公式二:

设α为任意角,π+α的三角函数值与α的三角函数值之间的关系:

sin(π+α)= -sinα

cos(π+α)= -cosα

tan(π+α)= tanα

cot(π+α)= cotα

公式三:

任意角α与 -α的三角函数值之间的关系:

sin(-α)= -sinα

cos(-α)= cosα

tan(-α)= -tanα

cot(-α)= -cotα

公式四:

利用公式二和公式三可以得到π-α与α的三角函数值之间的关系:

sin(π-α)= sinα

cos(π-α)= -cosα

tan(π-α)= -tanα

cot(π-α)= -cotα

公式五:

利用公式-和公式三可以得到2π-α与α的三角函数值之间的关系:

sin(2π-α)= -sinα

cos(2π-α)= cosα

tan(2π-α)= -tanα

cot(2π-α)= -cotα

公式六:

π/2±α及3π/2±α与α的三角函数值之间的关系:

sin(π/2+α)= cosα

cos(π/2+α)= -sinα

tan(π/2+α)= -cotα

cot(π/2+α)= -tanα

sin(π/2-α)= cosα

cos(π/2-α)= sinα

tan(π/2-α)= cotα

cot(π/2-α)= tanα

sin(3π/2+α)= -cosα

cos(3π/2+α)= sinα

tan(3π/2+α)= -cotα

cot(3π/2+α)= -tanα

sin(3π/2-α)= -cosα

cos(3π/2-α)= -sinα

tan(3π/2-α)= cotα

cot(3π/2-α)= tanα

(以上k∈Z)

这个物理常用公式我费了半天的劲才输进来,希望对大家有用

A·sin(ωt+θ)+ B·sin(ωt+φ) =

√{(A^2 +B^2 +2ABcos(θ-φ)} ?6?1 sin{ ωt + arcsin[ (A?6?1sinθ+B?6?1sinφ) / √{A^2 +B^2; +2ABcos(θ-φ)} }

√表示根号,包括{……}中的内容。